you may have heard about Wobblevision , Wave Vessel , Analog Visualization Unit, AVU, Psychoscope, o-scope , b&w tv into a large screen oscilloscope kits - -
this is it all in one

Before we begin, I have to give everyone a warning.
DO NOT ATTEMPT THIS PROJECT!
MODIFYING TV IS A DANGEROUS PROCESS. DO NOT ATTEMPT THIS UNLESS YOU KNOW THE DANGERS OF CAPACITORS AND
OTHER ELECTRONIC COMPONENTS. THERE IS A GREAT RISK OF POTENTIALLY DEADLY ELECTRIC SHOCK, AND THERE IS
THE POSSIBILITY OF FIRE OR EXPLOSION.
IF YOU TRY TO FOLLOW THESE INSTRUCTIONS, NO-ONE CANNOT BE HELD LIABLE FOR ANY DAMAGE OR DEATH CAUSED
WHILE BUILDING OR USING THE DEVICE

There are two areas which have particularly nasty electrical dangers: the non-isolated line power supply and the CRT high voltage.
stay away from the red cable with the suction cup end.

after you have opened the TV unit wear rubber gloves! (longer sleaves better)

the principal of this audio signal displaying is that
when TV is normally operated the Deflection Yoke generates a magnetic field and use it to direct the electron beam in the cathode-ray tube. Deflection Yoke gets signals from Deflection Circuit(Board) - Two of the wires control the horizontal motion, and the other two control the vertical motion. you just replace the Deflection Circuit Board signals whit audio signals and there you go.

i have made some schematics to clear how to route audio signals to Deflection Yoke- these schematics are based on information from Censtrons Wave Vessel page and my own experiments

first you need to find out the two horizontal and two vertical wires -
this will help

here you see the wires going to yoke

H=horizontal
Hg =horizontal ground
V=vertical
Vg=vertical ground

here is the unmoded version
whit this you can see normal TV programs

here is the Censtron version (a
whit this setup you get a bar that differens in length (a bit like panel of Kit[car from Knight Rider] when it was speaking)

here is the Censtron version (b
whit this setup you get vertical line that vibrates

here is the stereo version
whit this setup you get pulsing circles

the experimenting is still in progress so i will post more on this soon as i get more results

DBerning on audiokarma.org wrote:

Magnetic deflection TVs of this era needed the deflection yoke for energy storage for the flyback pulse that was used to provide high voltage for the CRT. Because I was using the yoke for audio deflection, I mounted a second deflection yoke somewhere in the TV cabinet so that the inductance from the winding could be used in the flyback-based high-voltage circuit.

so i might also try to find an extra yoke to the flyback pulse -
but sofar it works fine i have use my unit about 10 minutes at one time

There are two areas which have particularly nasty electrical dangers: the non-isolated line power supply and the CRT high voltage.
stay away from the red cable with the suction cup end.

after you have opened the TV unit wear rubber gloves! (longer sleaves better)

.... just some personal experience with this topic.... when I was still in high school, I had a summer job in a TV repair center. When servicing TVs, the first thing the techs would do would be to discharge the HV cap by shorting it to the chassis using a screwdriver. But sometimes this did not work as expected..... One day, a tech was attempting this, and the discharge arced across the surface of the screwdriver handle to the tech's hand and gave him a huge high voltage shock. He was knocked out instantly, fell over backwards and cracked his skull open on the floor. It nearly killed him. He also bit off the tip of his tongue in the process. I wouldn't stick my fingers in there for anything._________________Dave Peck

I appreciate Dave's warning, and the warnings that DNNY himself posted. As the admin here, I thought quite a bit about removing this post because of the dangers. I've decided to leave it here. There are many things in real life that are dangerous. Composing music can be dangerous too. Many years a ago a guy threatened to kill me because he didn't like my music, or maybe because his girlfriend did.

Well, working on TV sets is probably much more dangerous than composing music, but be very careful nonetheless. Also, be sure not to walk in front of a moving train and don't put your hand into a garbage disposal unit._________________--Howard
my music and other stuff

I thought quite a bit about removing this post because of the dangers.

Remove the post ... you americans are crazy ... this is FUN !!

But indeed try to be carefull, last time I toyed with a TV a power chip from the power supply exploded and parts of it hit the ceiling. An accidental short circuit, but I had to have it on for measurement to be made.

Magnetic deflection TVs of this era needed the deflection yoke for energy storage for the flyback pulse that was used to provide high voltage for the CRT. Because I was using the yoke for audio deflection, I mounted a second deflection yoke somewhere in the TV cabinet so that the inductance from the winding could be used in the flyback-based high-voltage circuit.

so i might also try to find an extra yoke to the flyback pulse -
but sofar it works fine i have use my unit about 10 minutes at one time

okay i did find the extra yoke - but it was not the same type - so this is what happened:

the picture was extremely bright! i mean really really bright. so i was very happy for a while it looked so cool.
after some 15 -30mins both of the TV sets fuses burn.
so what happened is that i drived the CRT whit too much voltage and it started to produce X-rays. so now im feeling really sick maybe because of the radiation overdose- hope that it goes away.

so what did we learn? -
if you want to ad the extra yoke to extra brightnes you need to measure the yokes inductance first and then find another yoke that has the same properties.
(or if you want a cheapo X-ray machine just replace the fuses whit thik wire)

i think deleting this post is not so good idea - i don't courage anyone to build this kind of unit - but there are always some jerks like me- that will do it anyway - so i want to share information that those people that do attempt this have as much info about it as possible

danielLast edited by dnny on Thu Jul 07, 2005 6:44 am; edited 1 time in total

I am really sorry to hear you are not feeling well, Daniel. I certainly hope you weren't exposed to Xrays. Maybe you just happend to get some bug. I hope that's more like it. Be sure to rest up and get your strength back.

No no, I'm not going to delete the thread. I just said that I considered it. Maybe it is pointless to say I'm considering doing something and then not doing it. You are right, it is good for people to learn from each other. That's what we are here for._________________--Howard
my music and other stuff

i called to The Radiation and Nuclear Safety Authority of Finland
and asked if i have been exposed to any radiation danger by moding my tv. and they sayid that there is very small possibility to get enough radiation from CRTs - in their test the maximum X-ray radiation from television has been 100mGy/h (hundred milliGrays per hour) and after that the tube has collapsed.

to get symptoms from X-rays you need to get at least 100Gy
the symptoms are then the same type of skin burns you get from sun.

the X-ray radiation on tv-set is stronger in the back of the tube than in the front. the X-ray borns when electrode hits the phosphor wall. X-ray bounces back to the inner walls of tube. it keeps bouncing and gets weaker and dies - the glass is thicker in the back so some x-rays get through but we are talking of really small amounts of radiation.

danielLast edited by dnny on Sun Apr 02, 2006 10:15 am; edited 1 time in total

so if we take a look also on these NON-fry yourself -models of TV oscilloscopes here is nice page whit detailed instructions and PCB layouts, front panels and all . . . its bit more complicated but it has more options

if you don´t want to pay £103.00 here are the PCB-layouts and instructions to make GBDSO (GameBoy Digital Sampling Oscilloscope) PDF (needs some SMD skills) you still have to order the EPROM chip from Elektor Electronics (£13.60) the pcb is also available for £8 . . .

but lets continue on this DIY oscilloscope talk by adding this LED-matrix oscilloscope schematic

the thing that happened to my Philips TX is that i tried to get the most of it and i used a random coil i savaged from some "i don´t remember what".

so i connected the coil lets say it was 50mH to the points of horizontal and horizontal ground of the Deflection Circuit(Board) - and wow it was cosmic - the beam was so bright - it was just like looking to sun. well i realized that the unit heated a lot - so i attached two ventilators . . . and i took it to "koneisto" ( The Festival For Electronic Music in Helsinki) it was in stage whit Aavikko. it lasted one hour all most the whole gig and died of over heating but i have to say that no TV has ever be so bright! all the time it looked that it will explode any minute

this is the setup what i did -

so i have been looking for the next TV (victim) to my experiments -
and i got now a correct size coil from the broken Philips TX

my Friend gave me a old soviet travel-TV that was not working but, it could display the usual noise. so i did the things described in this topic - but whit a 2mm pinjack -patch panel and speakon connector - so i can connect straight to my amp.
here are some pictures:

I think this should be make only by expert people like you who know what is to do.

I'm not an expert i just like experimenting - nowadays I'm coming more careful - specially after that "x-ray"-day and few other shocks that i got when working whit dimmers and strobes... but you can never be too careful and on the other hand if you scare too much you can never do anything - because the danger lurks everywhere _________________Association of experimental electronics
www.koelse.orgflickr: cable porn group

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